Machinists measuring-tool



(No Model.)

H. HOWARD.

MAOHINISTS MEASURING TOOL.

No. 386,469. Patented July 24, 1888.

N. Firms Photo Lnhn m nar, Waihmgion, D. c

UNTTEE STATES PATENT OEETcE.

HILT N HOXVARD, OF FITCHBURG, MASSACHUSETTS.

MACHINISTS MEASURING-=TOOL.

SPECIFICATION forming part of Letters Patent No. 386,469, dated July 24, 1888.

Application filed April 6, 1888. Serial No. 269,789.

To all whom it may concern.-

Be it known that I HILTON HOWARD, a citizen of the United States, residing at Fitch burg, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Machinists Measuringlools; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form part of this specification.

My invention relates to an improvement in a machinists tool, and has for its object a device for accurately measuring heights on planers, lathes, and other machinery, and also for obtaining correct inside diameters of pipes, holes, and other places where it is difficult to obtain correct measurement with an ordinary scale-rule; and it consists in the construction hereinafter described, and more partiularly pointed out in the claims.

Referring to the drawings, Figure l is a perspective view of myimproved device. Fig. 2 is a longitudinal section. Fig. 3 is a vertical cross section on the line at a: of Fig. 1. Fig. 4

is a vertical cross-section on the liney y of Fi 1. Fig. 5 is a vertical cross-section on the line 2 of Fig. 1. Fig. 6 is a perspective view of a modified form of my device, showing the steps and under edge ofthe base-piece rounded. Fig. 7 is a vertical cross section on the line 11 o of Fig. (3.

A represents a triangular or wedge shaped base piece or section having its inclined upper surface at one end extending to apoint on the plane of its base or under surface, while its opposite portion is gradually increased in a vertical depth and terminates in awide end provided with an car, a, projecting above the end and at a right angle to the upper inclined surface ofthe base-piece to serve as a bearing for an adjusting-screw. This car a is preferably formed integral with the base'piece, though, if desired, it may constitute a separate piece and be secured to the end of the base-piece by means of screws. On the upper or inclined side of the basepiece there is a tongue, I), which extends from its thin or smallest end to near the ear a at its vertically-thickened or largest end.

(No model.)

B represents a triangular step section of the same depth as the base'section and somewhat shorter, adapted to lit thereon with its thin or tapering end to the thin or tapering end of the base-section.

The step-section B is provided on its under side with a groove, 0, which fits over and slides upon the tongue I) of the basepicce. On the upper side ot the triangular piece B there are a series of graduated steps, O, each of which is parallel to the bottom of the base-piece and of a certain specific height from the bottom of the tool, as indicated on its side when the steppiece is in position, to register with the scale on the lower or base piece. On the under side and extending from the vertically'thickcned end of the steppiece B there is an enlarged inverted-U-shaped groove, 1), for the adj usting-screws, having its lower margin orllanges contracted, which extends about one-half the length of the step-piece. \Vithin the outer end of this groove D there is rigidly secured an annular ring, (I, which is screw-threaded on its inner side, and receives a thumb-screw, E, which is swiveled in the projecting car a on a parallel line with the upper face of the base piece. This screw is provided with rigid collars e on each side of the ear-piece, which holds the screw in position while it is turned in the hole of the car by the milled thumbpiece. By this construction the triangular step-piece Bis adjusted upon the incline of the base-piece to or from the car, as desired, to vary the heights of the steps from the plane of the base by a minute fraction.

Through the base-piece A, slightly toward its vertically-thickened or largest end fromits longitudinal center, there is a hole, F, from its straight under to its upper surface at right angles to its inclined upper side. This hole registers with the enlarged groovcDin thestcppiece B above, and is provided with a screw, f, somewhat smaller in diameterthanthehole. The upper end of the screwf is provided with a circular lug, G, elongated in the direction of and fitting within the groove 1), while the lower part of the screw has a milled nut, r resting in and extending through a lateral slot, H, in the base-piece A.

In operation the screw F is turned up or down to clamp the two triangular pieces to gether, or to loosen them to permit the step Upon the upper edge of the side of the base piece A there are marked various fractional scales, which, together with the heights of each step, (indicated on theside of the upper or triangular adjustable piece B,) enables the operator to measure the minutest difference in height or diameter of any space or opening in which the tool is adapted to be used.

To better adapt my measuring-tool for determining the diameter of key holes, pipes, and other circular openings, I may slightly modify its construction, as shown in Figs. 6 and 7, by making the steps 0 and bottom ofthe base-piece A semicircular in form, so that they will fit within the top and bottom of'eircular openings. In this construction I find it desirable also to changetheposition of the means for operating the holding-screw This is ac-" complished by extending theserew having an ordinary grooved head, h, thereon to near the bottom of the base-piece,which has a countersink therein to receive the head, leav'ingth'e outer surface of thcbase unobstructed. This screw is conveniently operated by a small screw-driver, and by this means the triangular step and base pieces are readily loosened,

so as to be adjusted one upon the other, or rigidly secured together in the same way as by the means heretofore described. 1 v

In operation, to ascertain the height of a space or opening, the tool,wit-h' its upper and lower sections adjusted to register with each other, according to the indicating-marks on its side, is thrust into the opening untilthe hi ghest step possiblehas passed under or within the opening, when the thumb-screw isturned, adjusting the step-piece upon the inclined base toward the ear holding the screwQuntil the space or opening is filled'by thetoohwhen the diameter of the space or opening will be indicated upon the side of the "tool,'andthe clamp-screw tightenedto hold the two sections rigidly together, when it can bewithdrawn.

Having fully described my invention,'w'h'at I claim as new, and desire to secure 'by' Letters Patent of the United States, is-

1. A machinists measuring-tool consisting of two wedgeshaped sections with their small or thin ends in the same direction, one of the sections being adjustable upon the 'ot'her,-as

and for the purpose set'forth. M

2. Ameasuring-tool consisting oftwo wedge shaped sections, oneof the sections having a tongue, and the other a groove fitting over the tongue and adjustable thereon, the two sec tionsbeiug adj ustably secured together, with their thin ends in the same direction, as set forth.

3. A measuring-tool consisting of two wedgefshaped sections, one adj ustably secured upon the other, with their thin ends in the same direction, the lower or base section having a bearing-ear for an adj usting-screw at the wide end extending ahovethe section, as and for the purpose set forth. 7

4. The combination, with a measuringtool consisting of two wedge-shaped sections adj ustably secured upon each other, with their thin ends in the samedirection, of a slot in the upper section, containing a lug having a screw in the lower section at right angles with its up- "per inclined surface, and an adjusting-screw ear on the lower section at right angles with "and extendingabove its upper inclined face,

as set forth.

5. A measuring-tool consisting of two wedgesh ap'e'd sections, one secured upon the other,

with their thin ends in the same direction, one 'of's'aid' sections having a'series of graduated steps parallel to the plane of the base of the other section and being'adjustable thereon, as

set forth, I

6. The combination, with a tool consisting of twofw'edge -shaped sections adj ustabl y secured together,"w'ith their thin ends in the same di rection, ofa series of steps on the upper section,wi'th an enlarged contracted groove on its under side containing a scrcwthreaded ring,

and the'lower or base section having at its wide end a bearing-ear at r'ig'ht'angles to its upper face extendingabove the section for an adj usting-screw, as set forth.

'7. 'The combinatiomwith afmcasuring-tool consisting of two wedge-shaped sections, one "section having atongue andthe other agroove, "the two'being adj ustabl y secured together,with "theirfthine'nds in the same direction, of a se rites of graduated steps on one' section parallel to the planeof the'base of the other section, withan enlarged contracted groove on its under side, "the other section having aclainpingcrew and bearing ear'at right angles to its inclined surface, said ear having anadjustingserew, ias' s'et'forth.

Intestiihonywhercof I affix 'rny'signatu're in "presence of twowitne'sses.

I HILTON HOWARD. 'Witnesses: I

JAMES OUTHBERT,

HENRY THRASHER. 

